Handwriting expert opinion needs to be exhibited?

In a civil suit, if trial court gives permission to one of the party to bring his private handwriting expert opinion on record. Now thereafter, when the expert comes personally with his opinion report, do the learned trial judge bound to exhibit that report before accepting or rejecting that opinion stipulated in that report?

If the learned trial judge, refuses to accept that report for some reasons which are recorded in writing in the judgement. Can that judgement be called unlawful, only because trial judge did not exhibit that report but directly mentioned it in its judgement?